From 19f4b485b346d3257ba4deb843021d48de7560ab Mon Sep 17 00:00:00 2001
From: SukkaW <isukkaw@gmail.com>
Date: Thu, 20 Nov 2025 02:23:09 +0800
Subject: [PATCH] Perf: wait longer before fetch fallback

---
 Build/lib/fetch-assets.ts | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Build/lib/fetch-assets.ts b/Build/lib/fetch-assets.ts
index 4d5ce866..79a99a22 100644
--- a/Build/lib/fetch-assets.ts
+++ b/Build/lib/fetch-assets.ts
@@ -7,6 +7,8 @@ import { ProcessLineStream } from './process-line';
 import { AdGuardFilterIgnoreUnsupportedLinesStream } from './parse-filter/filters';
 import { appendArrayInPlace } from 'foxts/append-array-in-place';
 
+import { newQueue } from '@henrygd/queue';
+
 // eslint-disable-next-line sukka/unicorn/custom-error-definition -- typescript is better
 class CustomAbortError extends Error {
   public readonly name = 'AbortError';
@@ -15,6 +17,8 @@ class CustomAbortError extends Error {
 
 const reusedCustomAbortError = new CustomAbortError();
 
+const queue = newQueue(16);
+
 export async function fetchAssets(
   url: string, fallbackUrls: null | undefined | string[] | readonly string[],
   processLine = false, allowEmpty = false, filterAdGuardUnsupportedLines = false
@@ -25,7 +29,7 @@ export async function fetchAssets(
     if (index >= 0) {
       // To avoid wasting bandwidth, we will wait for a few time before downloading from the fallback URL.
       try {
-        await waitWithAbort(200 + (index + 1) * 400, controller.signal);
+        await waitWithAbort(1800 + (index + 1) * 1200, controller.signal);
       } catch {
         console.log(picocolors.gray('[fetch cancelled early]'), picocolors.gray(url));
         throw reusedCustomAbortError;
@@ -38,6 +42,8 @@ export async function fetchAssets(
     if (index >= 0) {
       console.log(picocolors.yellowBright('[fetch fallback begin]'), picocolors.gray(url));
     }
+
+    // we don't queue add here
     const res = await $$fetch(url, { signal: controller.signal, ...defaultRequestInit });
 
     let stream = nullthrow(res.body, url + ' has an empty body')
@@ -49,7 +55,9 @@ export async function fetchAssets(
     if (filterAdGuardUnsupportedLines) {
       stream = stream.pipeThrough(new AdGuardFilterIgnoreUnsupportedLinesStream());
     }
-    const arr = await Array.fromAsync(stream);
+
+    // we does queue during downloading
+    const arr = await queue.add(() => Array.fromAsync(stream));
 
     if (arr.length < 1 && !allowEmpty) {
       throw new ResponseError(res, url, 'empty response w/o 304');